Over 350 global landmarks went dark for an hour on Saturday night, to honor Earth Hour. From Big Ben to the Empire State Building; the Eiffel Tower to the Sydney Opera House; Piccadilly Circus, Time Square, Tokyo Tower, and hundreds of famous buildings and cities in over 172 participating countries, it was lights out at 8.30 pm local time, for 60 minutes.

Beginning as an initiative from WWF in Sydney in 2007, this year’s Earth Hour was a celebration of ‘Places We Love,’ such as beaches, rivers, mountains, national parks, reefs and forests, which are all at risk as a result of climate change.